Question

Автомобиль двигался первую половину времени со сеоростью 60 км ч, а вторую со скоростью 40 км ч. Определите среднею скорость движения автомобиля на всем пути. ​

Answer 1

Ответ:

v₁=60 км/ч

v₂=40 км/ч

t₁=t₂=t

___________

v(ср)-?

v(ср)=S/t

t(общ)=t₁+t₂

S=v₁t₁+v₂t₂

v(ср)=(v₁t₁+v₂t₂)/(t₁+t₂)

При t₁=t₂=t

v(ср)=(v₁t+v₂t)/2t=(v₁+v₂)/2

v(ср)=(60+40)/2=50 км/ч

Задача была бы интересней, если бы было сказано о первой половине пути и второй, а не о половине времени.

Объяснение:

Answer 2

Ответ:

50 (км/час)

Объяснение:

60+40=100 (км/час)

100÷2=50 (км/час)

50 км/час

Answer 3

Calculation of Average Speed

To calculate the average speed of the car, we need to find the total distance traveled and the total time taken.

Let's assume that the car traveled a distance of d kilometers in the first half of the time and the same distance d in the second half of the time.

The time taken to travel the first half of the distance at a speed of 60 km/h is t1 = d/60 hours.

Similarly, the time taken to travel the second half of the distance at a speed of 40 km/h is t2 = d/40 hours.

The total time taken to travel the entire distance is t = t1 + t2 = d/60 + d/40 = (2d + 3d)/120 = 5d/120 = d/24 hours.

Therefore, the average speed of the car is given by the formula:

Average Speed = Total Distance / Total Time = 2d / (d/24) = 48 km/h.

So, the average speed of the car for the entire journey is 48 km/h.